CVE-2026-59822
KEV High · CVSS 8.2- CVSS
- 8.2
- nvd
- EPSS
- 0.87%
- 56th pct
- KEV
- Listed
- 2026-09-02
- Class
- oss containerizable
- CWE-287, CWE-306
Description
LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key validation with an empty UserAPIKeyAuth() object, allowing requests to reach MCP tooling without a valid LiteLLM key. This issue is fixed in version 1.84.0.
Affected packages
| PyPI | litellm | 0 → 1.84.0 |
References
- https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c
- https://github.com/BerriAI/litellm/pull/26463
- https://github.com/BerriAI/litellm/releases/tag/v1.84.0
- https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-59822
- https://www.wiz.io/blog/ai-infrastructure-honeypot
Status: profiled · ingested 2026-09-03T00:00:49.000Z